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💡 Enums (brief for enumerations) are a robust function in Python that permits for organizing a set of symbolic names (members) certain to distinctive, fixed values. Enums are a handy option to affiliate names with constants in a transparent and specific means.
Earlier than diving into the conversion strategies, let’s rapidly recap the Python enum
module. On this instance, Coloration
is an enumeration with three members: RED
, GREEN
, and BLUE
, related to the values 1, 2, and three, respectively.
MINIMAL ENUM EXAMPLE: 👇
from enum import Enum # Outline an enum named Coloration with a couple of members class Coloration(Enum): RED = 1 GREEN = 2 BLUE = 3 # Accessing members and their values Coloration.RED # <Coloration.RED: 1> Coloration.RED.title # 'RED' Coloration.RED.worth # 1
However how can we convert these enums to extra widespread information sorts and again? Let’s begin with the primary:
Python Convert Enum to String – and Again
Changing an Enum to a string might be notably helpful for show functions or when the enumeration must be serialized right into a format that requires textual content (like JSON). The reverse course of is useful when parsing strings to acquire Enum values.
from enum import Enum class Coloration(Enum): RED = 1 GREEN = 2 BLUE = 3 # Convert Enum to String color_string = Coloration.RED.title # Convert String to Enum color_enum = Coloration[color_string] print(color_string) # Outputs: RED print(color_enum) # Outputs: Coloration.RED
Right here, Coloration.RED.title
is used to transform an Enum member to a string. On the flip facet, Coloration[color_string]
converts a string again to an Enum member. That is notably useful in configurations or environments the place solely strings are usable.
Python Convert Enum to Int – and Again
Generally, you may have to convert Enum members to integers for indexing, interfacing with C code, or easy arithmetic. Conversely, changing integers again to Enums is important for sustaining the encapsulation of Enum sorts.
# Convert Enum to Int color_int = Coloration.RED.worth # Convert Int to Enum color_enum_from_int = Coloration(color_int) print(color_int) # Outputs: 1 print(color_enum_from_int) # Outputs: Coloration.RED
On this snippet, Coloration.RED.worth
provides the integer related to Coloration.RED
. To transform this integer again to an Enum, we name Coloration(color_int)
.
Python Convert Enum to Record – and Again
Changing an Enum to an inventory is helpful when you want to carry out operations that require sequence information sorts like iterations, mapping, and so forth. The reversal doesn’t apply sometimes as you wouldn’t convert an inventory straight again into an Enum, however you can recreate the Enum if wanted.
# Convert Enum to Record color_list = [c for c in Color] print(color_list) # Outputs: [<Color.RED: 1>, <Color.GREEN: 2>, <Color.BLUE: 3>]
This record comprehension iterates over the Enum class, changing it into an inventory of Enum members.
👉 Record Comprehension in Python — A Useful Illustrated Information
Python Convert Enum to Dict – and Again
When coping with Enum members in a dynamic method, changing it to a dictionary might be extremely helpful, particularly when the names and values are wanted straight.
# Convert Enum to Dict color_dict = {coloration.title: coloration.worth for coloration in Coloration} # Convert Dict to Enum class ColorNew(Enum): cross for title, worth in color_dict.objects(): setattr(ColorNew, title, worth) print(color_dict) # Outputs: {'RED': 1, 'GREEN': 2, 'BLUE': 3} print(ColorNew.RED) # Outputs: ColorNew.RED
Right here, we first create a dictionary from the Enum, guaranteeing every title maps to its respective worth. To transform it again, we dynamically generate a brand new Enum class and assign values.
Python Convert Enum to JSON – and Again
Serialization of Enums into JSON is crucial for configurations and community communications the place light-weight information interchange codecs are used.
import json # Convert Enum to JSON color_json = json.dumps(color_dict) # Convert JSON to Enum color_info = json.masses(color_json) color_enum_from_json = Coloration[color_info['RED']] print(color_json) # Outputs: '{"RED": 1, "GREEN": 2, "BLUE": 3}' print(color_enum_from_json) # Outputs: Coloration.RED
This instance reveals how you need to use a dictionary illustration to transform Enum members into JSON after which parse it again.
Python Convert Enum to Record of Strings – and Again
In some circumstances, an inventory of string representations of Enum members could also be required, resembling for populating dropdowns in GUI frameworks, or for information validation.
# Convert Enum to Record of Strings color_str_list = [color.name for color in Color] # Convert Record of Strings to Enum color_enum_list = [Color[color] for coloration in color_str_list] print(color_str_list) # Outputs: ['RED', 'GREEN', 'BLUE'] print(color_enum_list) # Outputs: [<Color.RED: 1>, <Color.GREEN: 2>, <Color.BLUE: 3>]
This simple comprehension permits for fast conversions to and from lists of string representations.
Python Convert Enum to Tuple – and Again
Tuples, being immutable, function an excellent information construction to carry Enum members when modifications usually are not required.
# Convert Enum to Tuple color_tuple = tuple(Coloration) # This showcases conversion however sometimes you will not convert again straight # Nevertheless, Enum members might be extracted again from the tuple if wanted print(color_tuple) # Outputs: (Coloration.RED, Coloration.GREEN, Coloration.BLUE)
Whereas the reverse is rare, extracting particular Enum members from a tuple is simple.
Python Convert Enum to Literal – and Again
Python sort hints help literals which might be useful in conditions the place perform parameters are anticipated to be particular Enum members solely.
from typing import Literal ColorLiteral = Literal[Color.RED.name, Color.GREEN.name, Color.BLUE.name] # Instance perform utilizing this literal def set_background_color(coloration: ColorLiteral): print(f"Setting background coloration to {coloration}") set_background_color('RED') # Appropriate utilization # Conversion again is actually parsing the literal to the Enum parsed_color = Coloration['RED'] # Works as anticipated print(parsed_color) # Outputs: Coloration.RED
Right here, Literal
is a means to make sure type-checking for capabilities that ought to solely settle for particular Enum members in string type.
Python Convert Enum to Map – and Again
The map
perform in Python can apply a perform over a sequence and is definitely demonstrated with Enums.
# Use map to transform Enum to a different type mapped_values = record(map(lambda c: (c.title, c.worth), Coloration)) # Usually you will not convert a map end result again to Enum straight # However you'll be able to reconstruct the Enum if wanted print(mapped_values) # Outputs: [('RED', 1), ('GREEN', 2), ('BLUE', 3)]
Mapping Enum values to a construction like tuple pairs can facilitate operations resembling sorting by both names or values.
Python Convert Enum to Record of Tuples – and Again
This conversion is helpful for creating listed constructions from Enums, helpful in situations the place a tuple-based lookup is required.
# Convert Enum to Record of Tuples color_tuples_list = [(color.name, color.value) for color in Color] # This could straight be used to reconstruct the Enum if wanted class ReconstructedEnum(Enum): RED = 1 GREEN = 2 BLUE = 3 print(color_tuples_list) # Outputs: [('RED', 1), ('GREEN', 2), ('BLUE', 3)] print(ReconstructedEnum.RED) # Outputs: ReconstructedEnum.RED
Although direct conversion again isn’t typical, reconstruction is an possibility right here.
Abstract of Strategies
- String: Convert with
.title
and restore withEnum[name]
. - Integer: Use
.worth
andEnum(worth)
. - Record: Immediately iterate over Enum.
- Dictionary: Comprehensions swimsuit effectively for conversions; Class redefinition helps in reverse.
- JSON: Make the most of dictionaries for intermediate conversions.
- Record of Strings: Enum names in an inventory simplify GUI use.
- Tuple: Direct use for immutable sequence necessities.
- Literal: Improve sort security.
- Map: Apply transformations with
map
. - Record of Tuples: Best for tuple-based construction necessities.
Utilizing Python Enums successfully means understanding how one can rework them to and from differing kinds, broadening their usability throughout varied points of Python programming.
👉 Python Dictionary Comprehension: A Highly effective One-Liner Tutorial
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Emily Rosemary Collins is a tech fanatic with a powerful background in laptop science, all the time staying up-to-date with the most recent developments and improvements. Other than her love for expertise, Emily enjoys exploring the nice outside, taking part in area people occasions, and dedicating her free time to portray and pictures. Her pursuits and fervour for private development make her an enticing conversationalist and a dependable supply of data within the ever-evolving world of expertise.
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